James Wanless on Sat, 12 Mar 2011 14:41:36 +0100

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Polrootsmod query

Why is PARI's implementation of polrootsmod so fast??? :)))
I've implemented my own version using GMP and Algorithm 1.6.1 of Cohen ACCANT, but PARI's seems order(s) of magnitude faster. What algorithm does polrootsmod use, pls? Maybe Cantor-Zassenhaus split etc., ie Cohen Algorithms 3.4.x, using matrices?? I've looked at PARI's code and haven't (yet?) understood it, despite noticing a few references to 'Berlekamp'...